_____ is a good form of exercise for both young and old.
| A．Walk | B．Walking |
| C．The walk | D．To walk |
The Great Wall istourist attraction that millions of people pour in every year.
| A． |
so a well-known |
B． |
a so well-known |
C． |
such well-known |
D． |
such a well-known |
Sally's never seen a play in the Shanghai Grand Theatre,?
| A． | hasn't she | B． | has she | C． | isn't she | D． | is she |
A small plane crashed into a hillside five miles east of the city, _____all four people on board. 
| A．killed | B．killing | C．kills | D．to kill |
You can’t borrow books from the school library ______ you get your student card.
| A．before | B．if | C．while | D．as |
With the government’s aid, those _____ by the earthquake have moved to the new settlements.
| A．affect | B．affecting | C．affected | D．were affected |